126 



Hughes (T. A.). Identification of Three Strains of Trypanosomas 

 from Cases of Sleeping Sickness contracted in Portuguese East 

 Africa with Trypanosoma rhodesiense. — Indian Jl. Med. Research, 

 Calcutta, viii. no. 2, October 1919, pp. 464-474, 1 plate. [Received 

 29th April 1920.] 



The cases from which the strains of trypanosomes here studied were 

 obtained, contracted the disease in the north of Portuguese East 

 Africa, a district infested with Glossina morsitans, the transmitter of 

 Trypanosoma rhodesiense. G. palpalis, the carrier of T. gambiense, is 

 believed not to occur in this part of Africa. The course of experiments 

 in the inoculation of various animals (rats, monkeys, rabbits, sheep, 

 a goat, a horse, and a baboon) are described. These experiments were 

 made to confirm the diagnosis of the cases. T. rhodesiense has a 

 peculiar typical posterior nuclear form and otherwise differs from 

 T. gambiense in being more virulent, atoxyl-resistant, producing 

 oedema of the face and keratitis in sheep and goats and in being 

 susceptible to the action of human and baboon sera. 



On the whole, from the course of the experiments, and of the disease 

 in the human cases and the fact that they came from an area infested 

 with G. morsitans, the strains were classified as T. rhodesiense. They 

 were atoxyl-resistant and the disease was severe. There were few 

 posterior nuclear forms in the sub-inoculated animals, showing that 

 certain strains of this parasite may produce these forms in very small 

 numbers and only in intense infections. The experiments on sheep 

 tended to show that the pathogenicity for certain animals may vary 

 in different strains. 



Rivera (A.). Necesidad de Extirpar la Garrapata. [The Necessity 

 of Exterminating the Tick.]. — Repnh. Donmiicana, Direc. Agric, 

 [sine loco], Vulg. Agric, Leaflet no. 2, [n.d.], 4 pp., 2 plans. 

 [Received 29th April 1920.] 



The prosperity of the cattle industry in the Dominican Republic 

 is heavily handicapped by the prevalence of bovine piroplasmosis, 

 due to the micro-organism Piroplasma bigeminum, of which the vector 

 is the cattle-tick, Boophilus (Margaropus) annulatus. The life-history 

 of this tick is described and illustrated by a chart. The method 

 advocated for extermination of this pest is the arsenical dip used in 

 the United States [R.A.E., B, iii, 35 ; i, vi, 143]. 



Fillers (A. W. U.). On the Occurrence of Tyroglyphus longior, 

 Gervais, in Skin Scrapings of Horses. — Yet. Record, London, 

 xxxii, no. 1657, 10th April 1920, p. 475, 1 plate. 



Attention is drawn to the occurrence of Tyroglyphus longior, Gervais, 

 in the skin scrapings of horses. This mite is more frequently found in 

 sarcoptic positive scrapings than in psoroptic positive scrapings, but 

 it is most often found alone. The hypopial nymphs are fairly com- 

 monly met with on the horses skin. 



